<!DOCTYPE html>
<html>

<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        .login-header {
            width: 100%;
            text-align: center;
            height: 30px;
            font-size: 24px;
            line-height: 30px;
        }
        
        ul,
        li,
        ol,
        dl,
        dt,
        dd,
        div,
        p,
        span,
        h1,
        h2,
        h3,
        h4,
        h5,
        h6,
        a {
            padding: 0px;
            margin: 0px;
        }
        
        .login {
            display: none;
            width: 512px;
            height: 280px;
            position: fixed;
            border: #ebebeb solid 1px;
            left: 500px;
            top: 100px;
            background: #ffffff;
            box-shadow: 0px 0px 20px #ddd;
            z-index: 9999;
            /* transform: translate(-50%, -50%); */
        }
        
        .login-title {
            width: 100%;
            margin: 10px 0px 0px 0px;
            text-align: center;
            line-height: 40px;
            height: 40px;
            font-size: 18px;
            position: relative;
            cursor: move;
        }
        
        .login-input-content {
            margin-top: 20px;
        }
        
        .login-button {
            width: 50%;
            margin: 30px auto 0px auto;
            line-height: 40px;
            font-size: 14px;
            border: #ebebeb 1px solid;
            text-align: center;
        }
        
        .login-bg {
            display: none;
            width: 100%;
            height: 100%;
            position: fixed;
            top: 0px;
            left: 0px;
            background: rgba(0, 0, 0, .3);
        }
        
        a {
            text-decoration: none;
            color: #000000;
        }
        
        .login-button a {
            display: block;
        }
        
        .login-input input.list-input {
            float: left;
            line-height: 35px;
            height: 35px;
            width: 350px;
            border: #ebebeb 1px solid;
            text-indent: 5px;
        }
        
        .login-input {
            overflow: hidden;
            margin: 0px 0px 20px 0px;
        }
        
        .login-input label {
            float: left;
            width: 90px;
            padding-right: 10px;
            text-align: right;
            line-height: 35px;
            height: 35px;
            font-size: 14px;
        }
        
        .login-title span {
            position: absolute;
            font-size: 12px;
            right: -20px;
            top: -30px;
            background: #ffffff;
            border: #ebebeb solid 1px;
            width: 40px;
            height: 40px;
            border-radius: 20px;
        }
    </style>
</head>

<body style="position: relative;">
    <div class="login-header"><a id="link">点击，弹出登录框</a></div>
    <div id="login" class="login">
        <div id="title" class="login-title">登录会员
            <span><a id="closeBtn" href="javascript:void(0);" class="close-login">关闭</a></span>
        </div>
        <div class="login-input-content">
            <div class="login-input">
                <label>用户名：</label>
                <input type="text" placeholder="请输入用户名" name="info[username]" id="username" class="list-input">
            </div>
            <div class="login-input">
                <label>登录密码：</label>
                <input type="password" placeholder="请输入登录密码" name="info[password]" id="password" class="list-input">
            </div>
        </div>
        <div id="loginBtn" class="login-button"><a href="javascript:void(0);" id="login-button-submit">登录会员</a></div>
    </div>
    <!-- 遮盖层 -->
    <div id="bg" class="login-bg"></div>
	<script type="text/javascript">
		//操作的元素对象
		var linkBtn = document.querySelector('#link');
		var loginDiv = document.querySelector('#login');
		var closeBtn = document.querySelector('#closeBtn');
		var bg = document.querySelector('#bg');
		var oTitle = document.querySelector('#title');
		//点击link，让模态框显示
		linkBtn.addEventListener('click',function(e){
			loginDiv.style.display = 'block';
			bg.style.display = 'block';
		});
		//点击关闭按钮，关闭模态框及背景遮罩
		closeBtn.addEventListener('click',function(e){
			loginDiv.style.display = 'none';
			bg.style.display = 'none';
		});
		
		//拖动效果
		oTitle.addEventListener('mousedown',function(e){
			console.log('鼠标按下...');
			//left和top如何计算呢？
			//先获取鼠标在盒子的坐标
			console.log(loginDiv.offsetLeft);
			var x = e.pageX - loginDiv.offsetLeft;
			var y = e.pageY - loginDiv.offsetTop;
			console.log(x+'==='+y);
			
			//拖动
			document.addEventListener('mousemove',moveDiv);
			function moveDiv(e){
				console.log('移动...');
				console.log("文档X值::"+e.pageX);
				console.log("鼠标X值::"+x);
				loginDiv.style.left = e.pageX-x+'px';
				loginDiv.style.top = e.pageY+'px';
			}
			
			//甩掉模态框
			document.addEventListener('mouseup',function(e){
				console.log('up....');
				document.removeEventListener('mousemove',moveDiv);
			});
			//获取x,y在
			//loginDiv.style.left = 
			
		});
		
		
		
	</script>
</body>

</html>